Jeffrey Blatttman updated OPENJPA-174:

    Attachment: pom.zip

this is a netbeans maven2 project that shows the error. the test case that 
fails is in PersistTest.java line 61 and 62. 61 fails. 62 succeeds (but is 
commented out right now.

to run the test case you need a derby network server running on localhost and 
default port.

> error when find()'ing an abstract class
> ---------------------------------------
>                 Key: OPENJPA-174
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-174
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 0.9.6
>         Environment: Java SE 5
> Derby 
>            Reporter: Jeffrey Blatttman
>         Attachments: pom.zip
> class B extends A
> A is abstract
> B is concrete
> i have persisted an instance of B. now i try:
> A a = em.find(A.class, anId);
> openjpa fails with:
> ... Cannot create new application identity instance for abstract   class 
> "class A"
> if i change the find to:
> A a = em.find(B.class, anId);
> openjpa works okay.
> note that i have two test cases. one is my real model, and one is the simple 
> A and B class example above. my real model fails, where the simple A, B class 
> example works as expected. so, it's is either a side affect of some other 
> issue, or there is something wrong in my model and the error message is 
> misleading or lacking information.

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